Lens Calibration

Many fo you know that I was having some focus problems from my Canon 7d. Here is an update on what is going on. I sent the camera back to canon for repair, and after 3 days (thanks CPS) the camera came back along with an explanation of the repair. The “focus assembly was adjusted” and a few other minor problems were discovered but were not a contributing factor to the focus problems ( one of the problems was with the compact flash reader causing an occasional err99). I got the camera back, and went out and shot a few images with the 17-35L and looked at the images and they looked pretty good. i was encouraged. then we left for a 3 day family trip to the smoky’s. I spent time shooting the camera, and found that a few of my lens were working great, and a few that were not working great. The 85L was out of focus, but it was focusing very consistently out of focus. I sat down this morning and calibrated all of my lenses. here are the targets after calibration:

85L @1.2:

Sigma 50 @1.4:
24L @ 1.4 ( i did have to sharpen this one because the 24L is pretty soft wide open):
Canon 17-40 @ 40mm, f4:
Camera was tripod mounted, and i shot tethered to my laptop so i could view the images at 1:1 or 1:2 magnification. All images are straight from camera with no edits (except for cropping on the wide angles, so you can’t see my messy kitchen 🙂 and for the 24L which was sharpened in PS).

I am hopeful that this will solve the problems. I’ll keep you posted.

Posted in DIY

One thought on “Lens Calibration

  1. Hey Benjamin. Now that you're calibrated by CPS. You may want to check out the Focus Pyramid Lens Calibration Tool. You can find it on Amazon, eBay an a bunch of other site. Give it a Google lookup, it's less than 20 bucks.

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